BPI HVAC Systems 3

Question 1

What is the function of the metering device in a refrigeration cycle?

Accepted Answer

Reduce refrigerant pressure and temperature entering the evaporator

Answer

The metering device (such as a TXV or orifice) drops refrigerant pressure and temperature so it can absorb heat effectively in the evaporator.

Question 2

A BPI analyst measures a 0.5 inches of water column (IWC) depressurization of the combustion appliance zone (CAZ) with all exhaust fans on. What action is required?

Accepted Answer

Flag as a spillage concern and investigate further

Answer

A CAZ depressurization of -0.5 IWC indicates potentially unsafe backdrafting conditions that require further investigation before completing weatherization work.

Question 3

Which duct insulation R-value is typically required by energy codes for ducts located in unconditioned attics in climate zones 4 and above?

Accepted Answer

R-8

Answer

Energy codes generally require R-8 duct insulation for supply and return ducts located in unconditioned attics in higher climate zones.

Question 4

What does HSPF measure for a heat pump?

Accepted Answer

Heating efficiency over a heating season

Answer

Heating Seasonal Performance Factor (HSPF) represents the total heating output divided by total energy consumed over an entire heating season.

Question 5

In a split-system air conditioner, where does heat rejection to the outdoors occur?

Accepted Answer

Condenser coil

Answer

The condenser coil, located in the outdoor unit, releases the heat absorbed indoors plus the heat of compression to the outside air.

(BPI) Building Performance Institute Certified Practice Test

(BPI) Building Performance Institute Certified Practice Test

BPI HVAC Systems 3